/**
* Simple program using threads.
*
*/
/**
* class Counter is runnable, so we can turn a counter object into
* a thread (the run() method is run when this happens).
*
* This class assigns unique ids to each Counter object, and the run
* method just counts to ten. Try using each of the run methods
* (rename the one you want to be executed to "run()" ) to see what
* happens to the thread scheduling
*/
class Counter implements Runnable {
static int id=0;
int myid;
int x;
public Counter() {
myid = id++;
x=0;
}
// this run is used to see what happens (to scheduling) when the
// threads don't wait for anything (and never call yield).
public void run() {
while (x<10) {
System.out.println("Counter["+myid + "]: value is " + x );
x++;
}
}
// name this one run() to see what happens when each thread goes
// to sleep regularly.
public void run1() {
try {
while (x<10) {
System.out.println("Counter["+myid + "]: value is " + x );
x++;
// let another thread run
Thread.currentThread().yield();
}
// uncomment this to see how having any thread alive keeps
// the program from quitting
if (myid==0) {
System.out.println("I refuse to die!");
while (true) {
// wait 100 ms.
Thread.currentThread().sleep(100);
}
}
} catch (InterruptedException ie) {
ie.printStackTrace();
}
}
}
class ThreadPlay {
// creates 5 counter threads and sets them running.
public static void main(String [] args) {
for (int i=0;i<5;i++) {
Thread t = new Thread( new Counter());
t.start();
System.out.println("Started thread " + i );
}
System.out.println("main is done - goodbye");
}
}